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. No Drawing.

a To all whom it may concern:

" U NITED srarns PATENT cr mes;

ARTHUR W SWANBERG, F MINNEAPOLIS, MINNESCSTA, ASSIGNOR '10 WALDO B.

IBERRYMAN, 0F LIMA, OHIO.

i Y LEAK-PROOF COMPOSITION FOR TIRES,

Be a known that I, ARTHUR w. swan I BERG, a citizen of the United States, and a resident of Minneapolis, in the county of Hennepin and State of Minnesota, have 1nvented a certain'new and useful Leak-Proof Composition for Tires; and I do hereby declare the following to be a full, clear, and.

exact description of the invention, such as will-enable others skilled in the art to which it appertains to make and use the same.

My invention relates to compositions for filling cracks, spaces and holes that may be formed inthe inner tube of pneumatic tires, such as automobile. tires.' Italso has for its object to provide'a preservative composition which will'produ'ce and cause the rubber to maintain its flexible condition and thus preserve it from deterioration.

The composition may be formed of a num-- ber of ingredients which have effects equiva-,

lent to the ingredientscontained in a preferred form of composition or embodiment of the invention. Likewise, the proportionate amounts'of the-ingredients may be varied to some extent without materially Varying the results of the composition or of the effect of the ingredients in their interrelation in the composition.

In" forming the composition, the material which is known in some trades as mineral wool is used. The'mineral wool that I prefer to use in my composition is that formed from slag by processes well known in the mesh. The material thus formed is their art. The mineral wool is subjected to heat from 300 to 600. C. to prevent balling the composition which otherwise occurs when" the composition is prepared and inserted in.

the tires. The fibrous material is torn and broken and then screened to remove all silica lobules that are found in the material. The Targer fibers are broken by being forced mixed with a mixture of gelatin and soap.

' The mixture of gelatin and soap is prepared by usin preferably a ver fine powdered glue an powdered soap 0 any kind. The glue and soap is mixed to ether in quantities by weight of two of t e glue to one of Specification of Letters Patent.

Patented Dec. 23, 1919.

Application flied May 20, 1918. Serial No. 235,706.

the soap. The soap revents the glue from becoming hard and orming a hard coating on the surface of the rubber when the composition is inserted in the tire. The mixture of glue and soap forms a vehicle for the a like, the life of the inner tube is g eatly increased in length.

In the preferred form of the mixture, the

pulverized mineral wool prepared, as above given, is mixed with a mixture of glue and 'soap in proportions of 16 of the mineral wool preparation to one of the mixture of powdered glue and soap. The proportion of the prepared mineral wool and the glue and soap, however, may be varied. 'It is, however,preferable not to use a proportion of not more than 25 of the powdered wool to 1 of the glue and soap mixture and not less than 5 of the prepared mineral wool to 1 of' the glue and soa mixture.

In the use of t e composition, two ounces of the composition are thoroughly mixed with a, quart of water, preferablysoft or The mixture of the com'posi-f tion and water is then inserted into the in her tube which-may be done by removing rain water.

the valve and inserting or forcing the mixture through the stem, whereupon the valve is replaced and air is pumped into the tire and rotated in order to spread the composition over the surface of the inner 'tube.

In case of puncture of the tire, the composition fills the opening as soon as the tire is turned so as to bring the opening below the composition'and the air pressure forces the composition into the opening and to a minute degree 'into the outer surface of the inner tube and the surface of the casing. The composition thus fills and blocks the opening-and is held in the opening by the r air pressure. The same is also true in filling the pores of theinner tube and 't hus renders aporous tube non-porous.

Icla'1m:--

tire tubes, a mixture of about 16 and soap in proportions ofabout two "of gelatin to one of soap and; two ounces of the mixture mixed with a quartof water. v

In testimony whereof, I have hereunto signed my name, to this specification;

ARTHUR WFSWA BERG. 

